对II型JAK2抑制剂的新支架克服了获得的G993A耐药性突变
Matthew L Arwood1, Yao Liu2, Shannon K Harkins3
1Molecular and Translational Cancer Biology Program, Stanley Manne Children's Research Institute, Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, IL 60611, USA.
Cell chemical biology
|June 8, 2023
概括
研究人员开发了新型II型JAK2抑制剂,对血液恶性瘤有效. 这些化合物在临床前模型中表现有前途,克服了耐药性突变,提供了新的治疗途径.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 在瘤学瘤学.
背景情况:
- 经常发生的Janus 激酶2 (JAK2) 改变导致骨髓增殖性新生体和其他血液性恶性瘤.
- 现有的I型JAK2抑制剂在这些疾病中表现出有限的疗效.
- 第二种类型的JAK2抑制剂稳定了非活性激酶结构,显示了改善治疗活性的潜力.
研究的目的:
- 确定和开发具有增强疗效和选择性的新型II型JAK2抑制剂.
- 描述新发现的JAK2抑制剂的作用机制和体内活性.
- 研究抵抗机制并开发克服它们的化合物.
主要方法:
- 选小分子库以识别选择性JAK2抑制剂.
- 合成和生物化学/细胞评价化合物类似物.
- 在体内有效性研究使用鼠标模型的真实多细胞血症.
- 共同晶体结构的确定,以确认II型结合模式.
- 对抗JAK2耐药性突变的化合物活性评估.
主要成果:
- 鉴定出一种有选择性的化合物及其具有强有力的目标生物化学和细胞活性的类似物.
- 化合物在多细胞血症真菌小鼠模型中表现出显著的体内疗效.
- 同晶体结构证实了II型结合模式,将JAK2锁定在"DFG-out"形状中.
- 新型JAK2类似物对一种G993A突变表现出活性,使其对现有的II型抑制剂产生耐药性.
结论:
- 这些已识别的化合物代表了一类有前途的II型JAK2抑制剂,用于治疗JAK2驱动的血液恶性瘤.
- 这些抑制剂在临床前模型中显示出有效性,并且可以克服特定的耐药性突变.
- 这些发现为开发下一代JAK2向疗法提供了框架,这些疗法具有改进的耐药性.
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